[dia] Don't use deprecated function gtk_rc_style_unref().

[Hans Breuer <hans src gnome org>]

commit a7426a16d6b7fe71da5cffed65b79aa38fbe4d83
Author: Adam Buchbinder <adam buchbinder gmail com>
Date:   Mon May 4 12:22:56 2009 -0400

    Don't use deprecated function gtk_rc_style_unref().
    
    Replaced gtk_rc_style_unref() with g_object_ref():
    http://library.gnome.org/devel/gtk/stable/gtk-Resource-Files.html#gtk-rc-style-unref
    
    Signed-off-by: Adam Buchbinder <adam buchbinder gmail com>
    Signed-off-by: Hans Breuer <hans breuer org>
---
 app/interface.c    |    2 +-
 app/layer_dialog.c |    2 +-
 lib/widgets.c      |    2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/app/interface.c b/app/interface.c
index 40510be..26885b3 100644
--- a/app/interface.c
+++ b/app/interface.c
@@ -541,7 +541,7 @@ use_integrated_ui_for_display_shell(DDisplay *ddisp, char *title)
   rcstyle = gtk_rc_style_new ();
   rcstyle->xthickness = rcstyle->ythickness = 0;
   gtk_widget_modify_style (close_button, rcstyle);
-  gtk_rc_style_unref (rcstyle),
+  g_object_unref (rcstyle),
 
   image = gtk_image_new_from_stock (GTK_STOCK_CLOSE,
                                     GTK_ICON_SIZE_MENU);
diff --git a/app/layer_dialog.c b/app/layer_dialog.c
index f069f41..a1ebfab 100644
--- a/app/layer_dialog.c
+++ b/app/layer_dialog.c
@@ -318,7 +318,7 @@ GtkWidget * create_layer_view_widget (void)
   rcstyle = gtk_rc_style_new ();
   rcstyle->xthickness = rcstyle->ythickness = 0;
   gtk_widget_modify_style (hide_button, rcstyle);
-  gtk_rc_style_unref (rcstyle);
+  g_object_unref (rcstyle);
 
   image = gtk_image_new_from_stock (GTK_STOCK_CLOSE,
                                     GTK_ICON_SIZE_MENU);
diff --git a/lib/widgets.c b/lib/widgets.c
index 9b4f84a..2d5ba2a 100644
--- a/lib/widgets.c
+++ b/lib/widgets.c
@@ -2188,7 +2188,7 @@ dia_toggle_button_new(GtkWidget *on_widget, GtkWidget *off_widget)
   rcstyle = gtk_rc_style_new ();  
   rcstyle->xthickness = rcstyle->ythickness = 0;       
   gtk_widget_modify_style (button, rcstyle);
-  gtk_rc_style_unref (rcstyle);
+  g_object_unref (rcstyle);
 
   prop = g_new0(GValue, 1);
   g_value_init(prop, G_TYPE_INT);